Oracle OLE C++ Classes/Select works/Insert fails

The select statement below works great, but when I try to insert, the (ores != OSUCCESS). Can read from TB1 but can not write.

Please Help

//****************************************************

OSession  oses;  // database session object
ODatabase odb;   // the database object
ODynaset  oDB1;  // dynaset object
oresult   ores;  // indicates whether operation succeeded
OStartup();     // Start Environment
//     open the default (unnamed) session
if(!oses.IsOpen())
  ores = oses.Open();
if (ores != OSUCCESS)
  MessageBox("oses.Open:", oses.GetErrorText() , MB_OK);

//     connect to the database
if(!odb.IsOpen())
  ores = odb.Open(oses, "MyDB.world", "system", "manager");
if (ores != OSUCCESS)
  MessageBox("ores.Open:", oses.GetErrorText() , MB_OK);

//******************************************************

strcpy(strFilter, "SELECT * FROM TBL1 WHERE FLD1 = 'A001'");
if(oDB1.IsOpen())
  oDB1.Close();
ores = oDB1.Open(odb, strFilter);
if (ores != OSUCCESS)
  MessageBox("oDB1.Open-Error:", oses.GetErrorText() , MB_OK);

//******************************************************

strcpy(strFilter, "INSERT INTO TBL1 VALUES ('A002')");
if(oDB1.IsOpen())
  oDB1.Close();
ores = oDB1.Open(odb, strFilter);
if (ores != OSUCCESS)
  MessageBox("oDB1.Open-Error:", oses.GetErrorText() , MB_OK);